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package org.netbeans.modules.javafx.refactoring.transformations;

import javax.swing.SwingUtilities;
import javax.swing.text.AbstractDocument;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import org.netbeans.editor.GuardedDocument;
import org.openide.util.Exceptions;

/**
 *
 * @author Jaroslav Bachorik <jaroslav.bachorik@sun.com>
 */
public class DocumentTransformer extends Transformer {
    final private static class DocumentModificator implements TransformationTarget {
        private Document doc;

        public DocumentModificator(Document doc) {
            this.doc = doc;
        }
        
        public void insertText(int pos, String text) {
            try {
                doc.insertString(pos, text, null);
            } catch (BadLocationException e) {
            }
        }

        public String removeText(int pos, int len) {
            try {
                String removed = doc.getText(pos, len);
                doc.remove(pos, len);
                return removed;
            } catch (BadLocationException e) {
            }
            return ""; // NOI18N
        }

        public void replaceText(int pos, String oldText, String newText) {
            try {
                doc.remove(pos, oldText.length());
                doc.insertString(pos, newText, null);
            } catch (BadLocationException e) {
                Exceptions.printStackTrace(e);
            }
        }
        
    }

    final private Document doc;

    public DocumentTransformer(Document doc) {
        super(getText(doc), new DocumentModificator(doc));
        this.doc = doc;
    }

    @Override
    protected void runTransformation(Runnable task) {
        if (doc instanceof GuardedDocument) {
            ((GuardedDocument)doc).runAtomic(task);
        } else {
            SwingUtilities.invokeLater(task);
        }
    }

    private static String getText(Document doc) {
        try {
            return doc.getText(0, doc.getLength()).replace("\r\n", "\n");
        } catch (BadLocationException e) {
            return ""; // NOI18N
        }
    }
}
